80521549 has 4 divisors (see below), whose sum is σ = 80543680. Its totient is φ = 80499420.

The previous prime is 80521547. The next prime is 80521559. The reversal of 80521549 is 94512508.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80521549 - 2¹ = 80521547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80521547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4179 + ... + 13360.

It is an arithmetic number, because the mean of its divisors is an integer number (20135920).

Almost surely, 2^80521549 is an apocalyptic number.

It is an amenable number.

80521549 is a deficient number, since it is larger than the sum of its proper divisors (22131).

80521549 is a wasteful number, since it uses less digits than its factorization.

80521549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22130.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 80521549 is about 8973.3800209286. The cubic root of 80521549 is about 431.8212798824.

The spelling of 80521549 in words is "eighty million, five hundred twenty-one thousand, five hundred forty-nine".